Fix test coverage in workday

[gjohansson-ST]

Proposed change

Fix test coverage in workday
Also fixes a bug with language being en which is not possible (lib doesn't support it)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
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• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @fabaff, mind taking a look at this pull request as it has been labeled with an integration (workday) you are listed as a code owner for? Thanks!

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[EliSchleifer]

LGTM

[EliSchleifer]

better variable naming would be nice - but this file follows pattern of unspecified variables.